感谢同学的英语两句话可以是：

Thanks for your company and support. You bring sunshine and color to my life.

You are not only a great classmate but also a good friend. Thank you for being there for me.

这两句话简洁而真诚，适合用来表达对同学的感激之情。第一句话强调了同学带来的积极影响，第二句话则突出了同学作为朋友的重要性。